Santa Cecilia in Trastevere Church, Rome, was the setting on June 25 for the marriage of Joellyn Marie Kuhnlein of New Haven, Ct., daughter of Mrs. Daniel E. Kuhnlein, Grosse Pointe, Mich. and the late Mr. Kuhnlein, to Kevin Douglas Gray. The bridegroom is the son of Mrs. Robert L. Schreiber, Rockville, Md. and the late Dr. H. William Gray. Father Thomas Fahy officiated.

Mrs. Gray recently received a master's degree in public and private management from Yale University. She studied urban and environmental planning in the University of Virginia graduate program. Earlier, she received a bachelor's degree in English from Wesleyan University (Ct.), where she was awarded the Johnston Trust Scholarship. Her father was an attorney and vice president of the Manufacturer's National Bank in Detroit. Her mother is a teacher with the Detroit Public School System.

The bridegroom resides in Rome where he completed a United Nations course at the International Congress for the Conservation and Restoration of Monuments (ICCROM). Mr. Gray served with the archetecture consultant to Connecticut's Judicial Department, received a bachelor's degree cum laude from the University of Pennsylvania. Later, he received a master's degree at Penn State, winning the Cret Medal for best thesis, the Schenk-Woodman Prize, and the Brook Medal for excellence in architectural design. His father had practiced ophtalmology for more than 30 years in Washington, D.C. His mother, known professionally as Joan M. Gray, is an interior designer.

Following a honeymoon in Europe, the couple will reside in New York.